|
发表于 2012-4-28 08:03:12
|
显示全部楼层
a spectrum analyzer should be able to measure the power supply noise.
Typically, VCO design requires a supply regulator to isolate the supply noise. For your VCO, you can characterize the gain Kvco and Kvdd, which is the vco gain referred to the Vctrl port and Vdd. There is tradeoff in Kvco selection. when it is large, the noise contribution is also large; when it is small, you lose tuning range. But at least a regulator could reduce the noise from Vdd, which contributes phase noise from Vdd directly to VCO output and also indirectly from Vdd to Vcntl and then to VCO output. |
|